I am working on powertools site. i have created a custom product model and in powertoolsProduct catalog I have imported my own products. I am implementing solr search functionality. I have added some product attributes as facet. They are working fine. But OOB category facet is not working. Its not even getting displayed on Front end under Refinements option. I have checked in solr admin schema browser. there is no field available for categoryName_text and category_string. But it does exists in other schema. what could be wrong in this case?